Hugo has an option built-in to watch the directory and rebuild pages automatically. It can also reload the browser automatically using the optional LiveReload plugin: http://gohugo.io/overview/usage/
In general: What would be the best approach towards having a part of the website static (main part), and only the blog/press part being regenerated?
Does Hugo/Pelican/Jekyll/Hakyll etc handle this kind of functionality?
As an alternative, what would be a good light weight CMS these days (ideally in Python)?